Negative Feedback Gain Control

[jnb]

Originally posted by AndrewT
C605//C607 are the DC block on the NFB return.
They increase the DC impedance to near infinity with the result that the DC gain falls to near 1times (+0db).

Could these be made smaller, to limit the low frequency response of the amp (like a filter) and to get away with a smaller higher quality cap? What issues could this create?

[AndrewT]

Originally posted by jnb
Could these be made smaller, to limit the low frequency response of the amp (like a filter) and to get away with a smaller higher quality cap? What issues could this create?

you can, but you shouldn't.
Use the input filters to control the bandwidth of the amplifier.

[jnb]

Thanks, Andrew, I will.